LNK6448K

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The LNK6448K controller IC is a single-chip solution designed to monitor and control offline switchers. It is designed to simplify the development of offline switchers from concept to production, and reduce the total system cost. It provides a more efficient, reliable and cost optimized power infrastructure for standalone AC/DC converters for low-power applications.

LNK6448K controller IC combines a power management IC (PMIC), a suite of advanced features and fixed-frequency peak current mode control to achieve complete power management of offline switchers. It can achieve 100 percent duty cycle with minimum MOSFET stress, hence increasing output power and efficiency. The IC works with a wide range of industry-standard PWM power control solutions and comes with integrated short-circuit protection and adjustable circuit control.

LNK6448K controller IC has multiple operating modes to fit a variety of operating conditions. The adjustable current and voltage limits provide smooth transition from start up to operating mode. The design is suitable for line powered systems with wide input voltage range of 85 to 265 volts AC and covers loads from low power standby to high power systems. Other features include adjustable soft-start, Auto-Restart and Cycle-by Cycle current limiting.

The LNK6448K controller IC is built on the latest mixed technology process, delivering performance and robustness in a small form factor. The CS-mode feature allows the users to adjust the peak inductor current limit and the valley current limit, to optimize the loop gain performance, to reduce the circulating current and reduce the power dissipation in the MOSFETs. Additionally, a soft start feature helps to reduce the inrush current when the device is powered up.

The LNK6448K working principle is based on a peak-current-mode control approach. It features an internal oscillator that feeds a proportionally scaled signal to a comparator. This comparator compares the output of the compensator circuit against the modulated scaling signal. The comparator triggers the switching device when the sensed inductor current - scaled by the oscillator - exceeds a pre-determined level. The correct operating frequency is automatically determined based on the power supply voltage and output load. It uses an adjustable limit on the peak current to limit the total power dissipation.

In summary, the LNK6448K is a cost-effective and efficient solution for offline switchers with its single-chip power management, low power dissipation, small form factor and fixed frequency peak current mode control. Its adjustable current and voltage limits provide low stress operation and smooth transition from start up to operating mode. By incorporating advanced features such as short-circuit protection and adjustable circuit control, it provides a reliable power infrastructure for standalone AC/DC converters in low power applications.

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